<!DOCTYPE html>
<title>View transitions: pageswap navigationactivation for traverse navigations</title>
<link rel="help" href="https://drafts.csswg.org/css-view-transitions-2/">
<link rel="author" href="mailto:khushalsagar@chromium.org">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="resources/common.js"></script>
<style></style>
<script>
const channel = new BroadcastChannel("testchannel");

const params = new URLSearchParams(location.search);
const is_initial_page_first_navigation = params.has('popup') && navigation.entries().length == 1;
const is_new_page = params.has('new');
const is_test_page = !params.has('popup') && !params.has('new');

function enableViewTransition() {
  document.styleSheets[0].insertRule(`
      @view-transition {
        navigation: auto;
      }
    `);
}

if (is_new_page)
  enableViewTransition();

// The test page which opens a popup for the navigation sequence.
if (is_test_page) {
  const expectedUrl = location.href.split('?')[0] + "?popup";
  const expectedEvents = ["pageswap", "transition", expectedUrl, "traverse","from", "pagehide"];

  promise_test(async t => {
    let popup;
    onload = () => {
      window.events = [];
      popup = window.open("?popup");
    };

    await new Promise(resolve => {
      channel.addEventListener(
        "message", t.step_func(async (e) => {
          if (e.data === "nav") {
            assert_array_equals(window.events, expectedEvents, 'incorrect event order');
            popup.close();
            resolve();
          }
      }));
    });
  }, `pageswap on traverse navigation from script`);
} else if (is_initial_page_first_navigation) {
  // The popup page which the user navigates back to.
  onload = async () => {
    await disableBFCache();
    requestAnimationFrame(() => requestAnimationFrame(() => {
      location.href = location.href.split('?')[0] + '?new';
    }));
  };

  onpageshow = (e) => {
    assert_false(e.persisted, 'the test should run without BFCache');
  }
} else if (is_new_page) {
  onload = () => {
    requestAnimationFrame(() => requestAnimationFrame(() => {
      navigation.back();
    }));
  };

  onpageswap = (e) => {
    window.opener.events.push("pageswap");
    if (e.viewTransition != null)
      window.opener.events.push("transition");
    window.opener.events.push(e.activation.entry.url);
    window.opener.events.push(e.activation.navigationType);
    if (e.activation.from == navigation.currentEntry)
      window.opener.events.push("from");
  };

  onpagehide = () => {
    window.opener.events.push("pagehide");
    channel.postMessage("nav");
  };
}
</script>
